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    Twin Cities Public Television
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    In this engineering activity, learners explore simple machines and then build cardboard automata using cams. Learners are also challenged to build a complex machine--a moving sculpture that tells a...

    $5 - $10 per group Ages 8 - 14 2 to 4 hours
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    Chicago Children's Museum
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    In this activity, learners use cardboard bases and track tubes to make a ball run to explore the properties of mass, force, and motion. Learners test their ball runs using balls of various sizes,...

    $10 - $20 per group Ages 4 - 6 10 to 30 minutes

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